pipeline: remove redundant assignment.
pipeline: remove redundant assignment.

If that block is entered, then start_time becomes GST_CLOCK_TIME_NONE.
Since start_time is invalid, the code will enter the block at line 434 and
new_base_time will be set there.

drothlis/gstreamer,Distrotech/gstreamer,krichter722/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,centricular/gstreamer,drothlis/gstreamer,centricular/gstreamer,ensonic/gstreamer,krichter722/gstreamer,magcius/gstreamer,lubosz/gstreamer,Lachann/gstreamer,justinjoy/gstreamer,krichter722/gstreamer,Lachann/gstreamer,ahmedammar/platform_external_gst_gstreamer,ensonic/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,cfoch/gstreamer,Distrotech/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,collects/gstreamer,Lachann/gstreamer,ylatuya/gstreamer,cfoch/gstreamer,lubosz/gstreamer,mparis/gstreamer,krichter722/gstreamer,collects/gstreamer,ylatuya/gstreamer,Distrotech/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,lovebug356/gstreamer,collects/gstreamer,centricular/gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,drothlis/gstreamer,mparis/gstreamer,ensonic/gstreamer,centricular/gstreamer,Lachann/gstreamer,mrchapp/gstreamer,magcius/gstreamer,cfoch/gstreamer,lovebug356/gstreamer,surround-io/gstreamer,ahmedammar/platform_external_gst_gstreamer,jpxiong/gstreamer,ahmedammar/platform_external_gst_gstreamer,lubosz/gstreamer,drothlis/gstreamer,surround-io/gstreamer,ahmedammar/platform_external_gst_gstreamer,magcius/gstreamer,mparis/gstreamer,justinjoy/gstreamer,mparis/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,mrchapp/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,ylatuya/gstreamer,ylatuya/gstreamer,shelsonjava/gstreamer,lubosz/gstreamer,mrchapp/gstreamer,ensonic/gstreamer,Distrotech/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,magcius/gstreamer,jpakkane/gstreamer,collects/gstreamer,collects/gstreamer,justinjoy/gstreamer,mrchapp/gstreamer,ahmedammar/platform_external_gst_gstreamer,cfoch/gstreamer,drothlis/gstreamer,mrchapp/gstreamer,shelsonjava/gstreamer,magcius/gstreamer,cfoch/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,ylatuya/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,Distrotech/gstreamer,mparis/gstreamer,lovebug356/gstreamer